CN107269358A - SCR equipment with valve configuration component - Google Patents

SCR equipment with valve configuration component Download PDF

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Publication number
CN107269358A
CN107269358A CN201710213499.8A CN201710213499A CN107269358A CN 107269358 A CN107269358 A CN 107269358A CN 201710213499 A CN201710213499 A CN 201710213499A CN 107269358 A CN107269358 A CN 107269358A
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CN
China
Prior art keywords
valve
tank
configuration component
equipment
pressure
Prior art date
Application number
CN201710213499.8A
Other languages
Chinese (zh)
Other versions
CN107269358B (en
Inventor
法布里齐奥·奇尼
卢卡·马里尼
Original Assignee
劳士领汽车集团
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE102016205555.0A priority Critical patent/DE102016205555A1/en
Priority to DE102016205555.0 priority
Application filed by 劳士领汽车集团 filed Critical 劳士领汽车集团
Publication of CN107269358A publication Critical patent/CN107269358A/en
Application granted granted Critical
Publication of CN107269358B publication Critical patent/CN107269358B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066Selective catalytic reduction [SCR]
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433Pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/14Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1473Overflow or return means for the substances, e.g. conduits or valves for the return path
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06Parameters used for exhaust control or diagnosing
    • F01N2900/18Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806Properties of reducing agent or dosing system
    • F01N2900/1808Pressure
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

The present invention relates to the SCR device for motor vehicle, including tank, spraying equipment, fluid pipeline, delivery pump, valve configuration component, the SCR device is characterised by:Valve configuration component is configured to:The injection stream in the fluid pipeline from tank to spraying equipment is interrupted when the pressure of the spraying equipment side in the fluid pipeline on the pressure spraying equipment side quantitatively than valve configuration component of the tank side in the fluid pipeline on the tank side of valve configuration component is big to be less than ejection threshold;When tank side pressure quantitatively than the pressure big at least ejection threshold of spraying equipment side when allow injection stream to pass through, valve configuration component is configured to:When spraying equipment side pressure quantitatively it is bigger than the pressure of the tank side in fluid pipeline must be less than backflow threshold value when interrupt backflow in fluid pipeline from spraying equipment to tank, when spraying equipment side pressure quantitatively than the tank side in fluid pipeline pressure greatly at least flow back threshold value when allow to pass through, ejection threshold quantitatively be more than backflow threshold value.

Description

SCR- equipment with valve configuration component

Technical field

The present invention relates to a kind of SCR- equipment for motor vehicle, it includes:One is used to store reduction liquid, particularly The tank of watery urea liquid;One is used to that the spraying equipment that liquid is ejected into the gas extraction system of motor vehicle will to be reduced;One Fluid pipeline for reduction liquid to be transported to spraying equipment from tank;One is used for the conveying reduction liquid in fluid pipeline Delivery pump;With the valve being present in a fluid pipeline configuration component.

Background technology

A kind of such SCR- equipment for example as known in the A1 of DE 10 2,007 028 480.It is this disclosed SCR- equipment has a valve configuration component on the end of the upstream of fluid pipeline, and wherein valve configuration component is configured to use Fluid pipeline is closed in when the liquid level of the reduction liquid in tank is at or below minimum level.

Generally it is well known that SCR- equipment is used for by that will reduce liquid, usually watery urea liquid, is ejected into machine Reduction there is present in the gas extraction system of motor-car nitrogen oxides and thus reduce the discharge of poisonous waste of vehicle.

The content of the invention

The current purpose of the present invention is further to develop the SCR- equipment that literary head is addressed as follows, i.e., only when delivery pump exists Liquid flow is reduced during operation to be flowed at least along the flow direction from tank to spraying equipment.When delivery pump is not run, Flowing of the reduction liquid flow in fluid pipeline at least along the direction from tank to spraying equipment should be interrupted.By this Mode can realize point-device injection control.In addition, this point makes the dismounting of SCR- equipment simpler, because so may be used To prevent or at least quantitatively significantly limit reduction liquid from the unexpected leakage in SCR- equipment.

There is a solution in the prior art for this, but the solution is excessively complicated in structure: The A1 of WO 2015/078777 propose one siphon pipe of setting in delivery pump for this, and the siphon pipe prevents unexpected fluid stream.

The present invention addresses the SCR- equipment of type by literary head, but realizes that text is first in the case where that need not change delivery pump The purpose addressed, valve configuration component is configured in the SCR- equipment:Liquid on the tank side of valve configuration component The pressure of tank side in body pipeline is quantitatively set than the injection in the fluid pipeline on the spraying equipment side of valve configuration component The pressure of standby side is big to interrupt injection stream in fluid pipeline from tank to spraying equipment when must be less than ejection threshold;With when tank side Pressure quantitatively at least ejection threshold bigger than the pressure of spraying equipment side when allow injection stream to pass through, and valve configuration component structure Cause to be used for:When spraying equipment side pressure quantitatively it is bigger than the pressure of the tank side in fluid pipeline must be less than backflow threshold value when The backflow in the fluid pipeline from spraying equipment to tank is interrupted, and when the pressure of spraying equipment side is quantitatively than in fluid pipeline Tank side pressure greatly at least flow back threshold value when allow back up through, wherein ejection threshold quantitatively be more than backflow threshold value.

Thus ensured and only matched somebody with somebody when by the tank side towards tank for operating in valve configuration component of delivery pump with valve Reduction liquid ability is put between the spraying equipment side towards spraying equipment of component when there is a sufficient pressure difference in fluid pipeline Interior flowing.If delivery pump stopped in contrast, corresponding pressure difference is no longer present, thus at least injection stream can not surpass again Cross valve configuration component.

It is by quantitatively different threshold functions:For the backflow of the reduction liquid from spraying equipment to tank Than for reverse injection stream, smaller pressure difference is just enough to make it possible backflow.Thus in the spray from tank to spraying equipment Jet can also be realized after terminating using less pressure difference and therefore using the less volume flow in each chronomere One backflow, so as in order to which injection reduces the duration evacuation of liquid of liquid not into the waste gas stream of motor vehicle in it Pipeline.For this emptying than being used to produce injection stream needed for pump power small pump power it is sufficient that.

Usual delivery pump is arranged in the flow path between tank and spraying equipment.Preferred valve configuration component is arranged on defeated Send between pump and spraying equipment.

In order to ensure only abundant pure reduction liquid reaches spraying equipment from tank, SCR- equipment can valuably include One filter.It is preferred that or this filter is arranged in tank, such as vicinity in reduction liquid extracting position from tank will The filter can be arranged on outside tank, then also, it is preferred that being close in the vicinity of reduction liquid extracting position from tank.As Optionally or additionally, valve configuration component can be arranged between filter and delivery pump, therefore can also be set and compared only one More valve configuration components.

It is advantageous to which valve configuration component is arranged between delivery pump and spraying equipment, because then passing through the row of backflow Being not remain in during empty fluid pipeline between valve configuration component and delivery pump can not be further continued for being transmitted back to tank in some cases Interior fluid column.

For evacuation of liquid pipeline as thoroughly as possible, preferably delivery pump is also disposed at the vicinity of tank, particularly preferably directly It is arranged on tank or even in tank.Delivery pump is in order to economical space saving set SCR- equipment to be arranged on a tank of tank On wall.

In principle it is contemplated that using two delivery pumps, the first delivery pump is used to realize that injection stream and the second delivery pump are used for Realize backflow.In this case, the delivery pump being each separately provided can be arranged in a fluid pipeline alone.Two Single fluid pipeline mutually converges in common tank volume and in spraying equipment side at the latest before injection nozzle at the latest in tank side Mutually converged in one common cavity or in a common liquid stream section.Then can be in fluid pipeline it is each it is interior set Each sub-valve configuration component.But this cost of equipment seems that comparison is high.

In order to provide SCR- equipment of the present invention with equipment as small as possible and construction expenditure, therefore preferably:Delivery pump is one The pump of individual way traffic, the pump is configured for both realizing the pressure difference for causing injection stream or realizes the pressure difference for causing backflow.Thus It can both realize that injection stream can also be realized back by one and same delivery pump by the commutation of the conveying direction on delivery pump Stream.So a fluid pipeline just can be completely enough.

In order to reliably avoid reduction liquid at least along injection stream direction, i.e., use up along the direction from tank to spraying equipment Pipe delivery pump transfixion can still exceed valve configuration component, preferably:Ejection threshold is more than the pressure of a hydrostatic, The pressure is achieved by the reduction liquid injected untill the pre-determined specified maximum packed height of tank.In addition In the case of the planform of well-known tank the pre-determined specified maximum packed space of tank and one it is pre-determined Specified maximum packed height is identical.Because when by the tank of a well-known planform be filled into it is pre-determined it is specified most During big volume, liquid level has the specified maximum packed height of identical in tank bottom all the time.It is right as in literary first expression Appropriate pressure difference will still be located at liquid enough for evacuation of liquid pipeline after the of short duration end of run in SCR- equipment Reduction liquid in pipeline is transmitted back in tank.Herein for the maximum flow rates flowed back typically not greater than 3.5l/ hours.It is preferred that The maximum flow rates of backflow are between 0 and 3l/ hours.

The maximum flow rates of injection stream are higher in contrast to this, because herein must be by certain quality stream according to waste gas stream The reduction liquid of amount is ejected into waste gas, so as to fill the nitrogen oxides for reducing contain in it in sub-degree.But injection stream Maximum flow rates be typically not greater than 7l/ hours and preferably between 3 and 6l/ hours.

As in principle preferably, if a unique fluid pipeline only is used only if injection stream and backflow, The different conveying pump powers wherein used can also can be clearly seen from injection stream and the different flow rates of backflow.

Delivery pump is preferably a gear pump, and the gear pump can make its conveying side simply by changing direction of rotation To commutation.

In order to reliably interrupt the flowing of the liquid in fluid pipeline, valve configuration component can have at least one valve body, The valve body by least one pre-tightening apparatus along opposite useful direction varying strength pretension in interruption position.Pretension is filled It can be a preloading spring to put in well-known mode itself.But pre- counter device can be identical with valve body, for example When a flexible leaf spring is used as into valve body.

Set only one valve body just can be enough in principle, the valve body with its interruption position-in the position it Interruption flow of fluid-can be moved in a flow passing position for starting point.Such as unique valve body can be in valve configuration group The pre-tightening apparatus that is acted on along opposite direction by varying strength in part or by only one along two possible fortune The pre-tightening apparatus of only one effect in dynamic direction is moved into flow passing position by starting point of interruption position.

Yet with using in the case of the unique valve body of only one there may be the sealing problem in interruption position, It is advantageous to:Valve configuration component has a single valve body, these valve bodies for each flowing in injection stream and backflow In the jet valve body for being at least attached to injection stream by a pre-tightening apparatus pretension in interruption position.By by valve body pretension It can ensure that valve interrupts the liquid flowing in fluid pipeline in the case of without from outside effect in interruption position.

What literary head was addressed, in order to make it possible in fluid pipeline on the one hand injection stream and on the other hand backflow and in number Different pressure differences can be by the one hand for jet valve body and on the other hand for the effect of return valve body varying strength in amount Pre-tightening apparatus is achieved.Return valve body can also be not provided with pre-tightening apparatus and by the fluid for the reduction liquid being accommodated in tank The pressure reloaded of static(al) is in interruption position.As supplement or optional, the pressure difference of varying strength effect can also pass through valve body Corresponding structure and different size of acting surface be achieved, the effect of the pressure that exists on these acting surfaces in fluid pipeline On valve body.

A valve ball or well-known lampshade valve body itself can be for example used as valve body.Lampshade valve body leads to Often there is a center body of rod, lampshade valve body is movingly supported in valve housing by the body of rod along body of rod axis.Then Lampshade valve body can along its body of rod in interruption position-in the interruption position it interrupt liquid flowing-with flow passing position- In the flow passing position it allow liquid flow-between move.Then lampshade valve body provides a lamp on a long end of valve rod Hood-like radially-protruding structure, the structure is used for the through hole in interruption position in closing valve shell.It is preferred that lampshade valve body structure Cause rotationally symmetrical.

Then when valve configuration component has multiple valve bodies, such as one jet valve body is used for injection stream and a backflow Valve body is used to flow back, and preferably all valve bodies are configured to likewise, to make assembling simpler.Wherein all valve bodies can be phase With, to avoid getting wrong in assembling.Identical valve body can pass through different preload piece applying powers, or only identical The a part of of valve body can be with preload piece collective effect, and other parts then can not.

Because valve configuration component discussed above is arranged in the fluid pipeline of SCR- equipment, by producing backflow row Fluid pipeline can be interrupted on valve configuration component in a beneficial manner after empty fluid pipeline, for example, matched somebody with somebody to change valve Put between component and spraying equipment or between valve configuration component and delivery pump pipeline branch road.In addition, having in the present invention It can specify that in the development design of benefit:Fluid pipeline is preferably directly matched somebody with somebody on the spraying equipment side of valve configuration component in valve Put on component, can routinely separate, can preferably be separated with the valve housing of valve configuration component.Conventional separability Refer to lossless separability, such as by the mutual removable threaded connection that sets each fluid pipeline section or/and Socket connection.

Brief description of the drawings

Below the present invention will be illustrated in further detail by accompanying drawing.It shows:

Fig. 1 for the present invention SCR- equipment rough schematic diagram and

Fig. 2 is the cross-sectional view of exemplary valve configuration component, as it can use that in Fig. 1 SCR- equipment Sample.

Embodiment

Figure 1 illustrates be generally designated 10 SCR- equipment of the invention.For automotive internal combustion engines The SCR- equipment of nitrogen oxides reduction in waste gas includes a tank 12, can be routinely high until a specified filling in the tank Injection reduction liquid 14, such as watery urea liquid untill degree 16.Not shown flow in pipes and such in Fig. 1, because Do not serve for the SCR- equipment of the present invention for it other.

Reduction liquid 14 can be transported to by a spraying equipment 20 by a fluid pipeline 18, there it is sprayed Into the waste gas of the explosive motor in unshowned gas extraction system in Fig. 1.

A delivery pump 22 is provided with order to which reduction liquid 14 is transported into spraying equipment 20 from tank 12, such as form is one Individual gear pump capable of reversing.

Delivery pump 22 as represented by the arrow using phase opposite sense can both realize the spray from tank 12 to spraying equipment 20 Jet E, can also be realized along from spraying equipment 20 to the backflow R in the opposite direction of tank 12.Such as by less, along returning As represented by the triangle for the direction sensing for flowing R, delivery pump 22 conveys smaller along backflow direction ratio along injection stream direction Volume flow or mass flow.

It is transported to the reduction liquid 14 of spraying equipment 20 in order to purify a filter plant 24, the filter plant can be set It is preferably mounted directly on tank 12 or interior.

Only liquid is reduced in order to ensure when causing a corresponding pressure difference in fluid pipeline 18 by delivery pump 22 14 actually just flow in fluid pipeline 18, and SCR- equipment 10 includes a valve configuration component 26, the valve configuration component It is preferably provided between delivery pump 22 and spraying equipment 20.As supplement or optional, a valve configuration component 26 ' can also be set Put between tank 12 or filter 24 and delivery pump 22.

Prevented when being configured for and being run when the non-corresponding of delivery pump 22 due to valve configuration component 26 reduction liquid 14 from Tank 12 arrives the leakage stream of spraying equipment 20, it is possible in valve configuration component 26 and fluid pipeline 18, more specifically valve One is set to connect according to removable pipeline is run between fluid pipeline section 18a on the spraying equipment side 26a of configuration component 26 28 are connect, pipeline connection is for example in order to repair or/and safeguard that make can be routinely from valve configuration component 26 by fluid pipeline 18 Pull down and be possibly realized.Corresponding content is applied to weight of the fluid pipeline 18 on the spraying equipment side 26a of valve configuration component 26 New connection.

Valve configuration component 26 it is opposite with spraying equipment side 26a, point to tank 12 and with this tank connected side 26b It is the tank side 26b of valve configuration component 26.

Schematically illustrate a possible structure of valve configuration component 26 roughly in fig. 2.

Valve configuration component 26 can have a valve housing 30, and valve body 32 and 34 can be movably disposed in the valve In door shell.

It is preferred that two valve bodies 32 and 34 are configured to identical, lampshade valve body is configured in shown example.Wherein valve Body 32 is a jet valve body 32, and the jet valve body so interrupts injection stream E for a long time, until the tank of valve configuration component 26 Untill more than one pre-determined pressure difference of pressure difference between side 26b and spraying equipment side 26a.Be enough by jet valve body 32 from The interruption position shown in Fig. 2 is moved to the pressure difference of the flow passing position for allowing injection stream E in the given in advance of jet valve body 32 It can be adjusted in the case of shape by the spring rate of valve spring 36, jet valve body 32 is preferably by the valve spring pretension In the interruption position shown in Fig. 2.

Jet valve body 32 closes the through hole 38 and 40 of injection stream E through valve configuration component 26 in interruption position.

So selection is supported on the valve spring 36 being in reverse on the long end of valve bonnet of the valve rod of jet valve body 32, that is, exists Stream of this jet valve body in the reduction liquid 14 being accommodated in tank 12 in the case of the shape given in advance of jet valve body 32 Be retained in the presence of the pressure of body static(al) in interruption position, more specifically even in reduction liquid 14 until it is specified most When being injected untill big packed height 16 in tank 12.Preferred valve spring 36 is designed with a margin of safety, and the margin of safety makes to surpass The specified maximum packed height 16 crossed in tank 12 is possibly realized, and the pressure of the hydrostatic of resulting reduction liquid 14 is not Jet valve body 32 can be removed from interruption position.

Valve body 34 is return valve body 34, and the return valve body allows backflow R by and for being interrupted for injection stream E.

Return valve body 34 and its arrangement in valve housing 30 are consistent with those of jet valve body 32, simply along opposite Direction, so in the case where noting direction difference in order to illustrate return valve body 34 with reference to provided above to jet valve body 32 Explanation.

Quantitatively be less than makes jet valve body 32 from interruption to pressure difference-return valve body 34 allows backflow R to pass through in the pressure difference- Required pressure difference is removed in position.

By using weaker valve spring or it can pass through in the case of identical valve body 32 and 34 is preferably used Valve spring is omitted completely realizes this pressure difference.

Due to being flowed back compared with injection stream E, R is generally carried out with smaller flow rate, it is possible to pass through return valve body 34 Ensure to depart from interruption position.Pretension in interruption position illustrated in fig. 2 is unnecessary, anyway pass through valve configuration component The pressure of the hydrostatic of reduction liquid 14 on 26 tank side 26b realizes this pretension.Therefore in order to by return valve body 34 from Interruption position shown in figure 2 is moved in flow passing position, need to only be overcome in valve housing 30 and backflow for backflow R The frictional force existed between valve body 34.

Thus when without using spraying equipment 20, such as when closing motor vehicle and explosive motor, by unique defeated Send pump 22 can by least from delivery pump 22 until the fluid pipeline 18 in the branch road that spraying equipment 20 stretches is emptied, thus can So that fluid pipeline 18 is located at into pipeline branch road 18a between valve configuration component 26 and spraying equipment 20 without reduction liquid 18 It is unexpected spill in the case of pulled down from valve configuration component 26.For this valve configuration component 26, particularly valve housing 30 There can be a screw thread to be used as the removable attachment means 28 for valve configuration component 26 to be connected with fluid pipeline 18. In order to which once needing completely to remove valve configuration component 26 from fluid pipeline 18, internal thread can be arranged on valve configuration group On the both sides of part 26.Helicitic texture (Gewindeausbildung) on the tank side 26 of valve housing 30 is labeled as 42.Thus liquid Connection of the pipe joint of body pipeline in order to realize impenetrable liquid can be screwed in internal thread 28 and 42.

Claims (10)

1. a kind of SCR- equipment (10) for motor vehicle, it includes:For storing reduction liquid (14), particularly watery urine The tank (12) of plain solution;For the spraying equipment (20) that liquid (14) is ejected into the gas extraction system of motor vehicle will to be reduced;For The fluid pipeline (18) that liquid (14) is transported to spraying equipment (20) from tank (12) will be reduced;For defeated in fluid pipeline (18) Return the delivery pump (22) of primary liquid (14);With the valve configuration component (26) being present in fluid pipeline (18), its feature exists In:Valve configuration component (26) is configured for:When in the fluid pipeline (18) on the tank side (26b) of valve configuration component (26) Tank side pressure quantitatively than the spray in the fluid pipeline (18) on the spraying equipment side (26a) of valve configuration component (26) The pressure of jet device side is big to interrupt when must be less than ejection threshold in fluid pipeline (18) from tank (12) to spraying equipment (20) Injection stream (E);With when tank side pressure quantitatively than the pressure big at least ejection threshold of spraying equipment side when allow injection stream (E) pass through, and valve configuration component (26) is configured for:When the pressure of spraying equipment side is quantitatively than fluid pipeline (18) The pressure of interior tank side is big must to be less than in the fluid pipeline (18) interrupted when flowing back threshold value from spraying equipment (20) to tank (12) Flow back (R), and when pressure of the pressure quantitatively than the tank side in fluid pipeline (18) of spraying equipment side at least flows back greatly threshold Allow to pass through during value, wherein ejection threshold is quantitatively more than backflow threshold value.
2. SCR- equipment (10) according to claim 1, it is characterised in that:Valve configuration component (26) is arranged on delivery pump (22) between spraying equipment (20).
3. SCR- equipment (10) according to claim 1, it is characterised in that:It includes filter (24), and wherein valve is matched somebody with somebody Component (26) is put to be arranged between filter (24) and delivery pump (22).
4. the SCR- equipment (10) according to Claims 2 or 3, it is characterised in that:Delivery pump (22) is the pump of way traffic, The pump is configured for both realizing the pressure difference for causing injection stream (E) or realizes the pressure difference for causing backflow (R).
5. the SCR- equipment (10) according to any one in preceding claims, it is characterised in that:Tank (12) has prior The specified maximum packed height (16) determined, wherein ejection threshold are more than the pressure of hydrostatic, and the pressure passes through until specified The reduction liquid (14) injected untill maximum packed height (16) is achieved.
6. the SCR- equipment (10) according to any one in preceding claims, it is characterised in that:The maximum of injection stream (E) Flow rate is no more than 7l/ hours, preferably between 3 and 6l/ hours, or/and the maximum flow rates of backflow (R) are no more than 3.5l/ hours, preferably 0 and 3l/ hours.
7. the SCR- equipment (10) according to any one in preceding claims, it is characterised in that:Valve configuration component (26) there is at least one valve body (32,34), the valve body is different along opposite useful direction by least one pre-tightening apparatus Intensity pretension in interruption position.
8. the SCR- equipment (10) according to any one in preceding claims, it is characterised in that:Valve configuration component (26) in order to which each flowing in injection stream (E) and backflow (R) has single valve body, spray is at least attached in these valve bodies The jet valve body (32) of jet (E) is by pre-tightening apparatus pretension in interruption position.
9. the SCR- equipment (10) according to claim 7 or 8, it is characterised in that:At least one valve body (32,34) is valve ball Or lampshade valve body, if wherein if valve configuration component (26) has multiple valve bodies (32,34), preferably all valve bodies (32, 34) it is same.
10. the SCR- equipment (10) according to any one in preceding claims, it is characterised in that:Fluid pipeline (18) exists It is routinely to divide preferably directly on valve configuration component (26) on the spraying equipment side (26a) of valve configuration component (26) From, it is preferably able to separate with the valve housing (30) of valve configuration component (26).
CN201710213499.8A 2016-04-04 2017-04-01 SCR device with a valve arrangement CN107269358B (en)

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US10024214B2 (en) 2018-07-17
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